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来源：学生作业帮助网 编辑：作业帮 时间：2024/07/18 16:41:10
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OA(OB+OC)
=OA(OA+AB+OA+AC)
=OA(2OA+2AM)
=2OA^2-4OA
=2(OA-1）^2-2
OA为1时,
原式最小为-2